Question

我在Arduino上编写C语言，而且我是一名初学者。我在这个程序中的目标是在LED上显示一个二进制数，然后让玩家猜出二进制数。然后播放器按下等于显示二进制数的十进制值的按钮。当玩家开始按下按钮时，每次按下都会有两秒钟。如果他们在这两秒钟内没有再次点击，他们就输了，或者他们猜对了，赢了。

我凌乱的程序唯一不做的就是按下每个按钮两秒钟。即使经过大量阅读，我也对milli（）;感到困惑。除了糟糕的编码之外，我可以在程序中更改某些内容，以便在按下按钮时为玩家提供两秒钟的窗口吗？我确信我会忽略一个细节。谢谢你的时间。

const int buttonPin = 2;     
const int ledPinValue1 =  3;     
const int ledPinValue2 =  4;      
const int ledPinValue4 =  5;     
const int ledPinValue8 =  6;  

int teller = 0;
int buttonStatus = 0;
int lastButtonStatus;

unsigned long interval=5000;    // the time we need to wait
unsigned long previousMillis = 0; // millis() returns an unsigned long.
unsigned long currentMillis = 0;
unsigned long elapsed;
unsigned long midElapsed;

unsigned long minus=5000;

int secondLoop = 0;

boolean allowTimer = false;
boolean allowMilliAfterFirstRound; //without this, when the second loop commences milli = milli - milli


void setup() {
    Serial.begin(9600);

    pinMode(ledPinValue1, OUTPUT);
    pinMode(ledPinValue2, OUTPUT);
    pinMode(ledPinValue4, OUTPUT);
    pinMode(ledPinValue8, OUTPUT);
    pinMode(buttonPin, INPUT);
}

void loop() {
    boolean initiateLoss = true; // ++++
    int randomNumber = 5; //Replace with randomcode
    currentMillis = millis();

    knopStatus = digitalRead(buttonPin);

    if (randomNumber == 1 || randomNumber == 3 || randomNumber == 5 || randomNumber == 7 || randomNumber == 9 || randomNumber == 11 || randomNumber == 13 || randomNumber == 15){
        digitalWrite(ledPinValue1, HIGH);
    }
    else {
        digitalWrite(ledPinValue1, LOW);
    }
    if (randomNumber == 2 || randomNumber == 3 || randomNumber == 6 || randomNumber == 7 || randomNumber == 10 || randomNumber == 11 || randomNumber == 14 || randomNumber == 15){
        digitalWrite(ledPinValue2, HIGH);
    }
    else {
        digitalWrite(ledPinValue2, LOW);
    } 
    if (randomNumber == 4 || randomNumber == 5 || randomNumber == 6 || randomNumber == 7 || randomNumber == 12 || randomNumber == 13 || randomNumber == 14 || randomNumber == 15){
        digitalWrite(ledPinValue4, HIGH);
    }
    else {  
        digitalWrite(ledPinValue4, LOW);
    } 
    if (randomNumber == 8 || randomNumber == 9 || randomNumber == 10 || randomNumber == 11 || randomNumber == 12 || randomNumber == 13 || randomNumber == 14 || randomNumber == 15){
        digitalWrite(ledPinValue8, HIGH);
    }
    else {
        digitalWrite(ledPinValue8, LOW);
    }

    //------------------------------------------------------------------------------------

    if (knopStatus != lastButtonStatus) {

        if (knopStatus == HIGH) {
            teller++;
            Serial.print("number of button pushes:  ");
            Serial.println(teller, DEC);
            allowTimer = true;


        }    
        delay(50);
    }

    //------------------

    if (allowTimer == true){        


        if (allowMilliAfterFirstRound == true) {
            currentMillis = currentMillis - currentMillis;
            allowMilliAfterFirstRound = false;
        }

        if (teller == randomNumber){ // WIN
            Serial.print("You won!");
            Serial.println();
            initiateLoss = false;
            randomNumber = 3; // remove when randomnumber is added
            teller = 0;
            previousMillis = millis();
        }  

        if ((unsigned long)(currentMillis - previousMillis) > interval && initiateLoss == true) {  // LOST!
            elapsed = currentMillis - previousMillis; 
            Serial.print("Time elapsed at time of failure: ");                             
            Serial.print(elapsed);
            Serial.println();
            Serial.print("currentMillis is now: ");
            Serial.print(currentMillis); // 5000, 10000, 15000, 20000 etc
            Serial.println();
            Serial.print("previousMillis is now: ");
            Serial.print(previousMillis); // 5000, 10000, 15000, 20000 etc
            Serial.println();
            previousMillis = millis();

            Serial.println();
            Serial.print("You lost!");
            Serial.println();
            Serial.print("Begin!");
            Serial.println();
            teller = 0;

        }
    }
    lastButtonStatus = knopStatus;  // save the current state as the last state, for next time through the loop 
}

Answer 1

我会做这样的事情：

void loop() {

if (not yet displayed) {
[all the code to display the number on leds]
}

if (button pressed) { 
allowTimer = true;  // Start!
}

if (allowTimer) /* If timer started */ {
   while (millis() - previousMillis <= 2000) /* The famous 2 sec */ {

      if (button pressed) {
      previousMillis = millis(); /* Update timing */
      teller++;
      }
   }
   if(teller == randomNumber) {
   [Hooray, you won or whatever message and stuff you like]
   }
   else {
   [Sorry, you lost]
   }

}

当然你应该用你的代码替换我的作品。

提示：对于任何语句中的单个指令，您不需要括号：

if (condition) {
onlyOneInstruction;
}

与

相同

if (condition) onlyOneInstruction;

编辑：此外，您尝试将knopStatus（未声明，也许您的意思是buttonStatus）与lastButtonStatus进行比较，但未初始化。这会给你一个错误。

Answer 2

有错误，例如：

if (allowMilliAfterFirstRound == true) {
    currentMillis = currentMillis - currentMillis;
    allowMilliAfterFirstRound = false;
}

并且allowMilliAfterFirstRound未初始化，也未分配到其他地方......

更一般地说，代码显示您正确理解millis。缺少的是对该计划所处的2个州的管理：

显示号码，然后等待玩家的回答：计算到超时的时间
显示获胜/失败的消息，只需按一下按钮即可开始另一个猜测（？）

previousMillis。

使用milli（）;按下按钮后延迟

2 个答案: